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Nanosize Effect of Al2O3 in Ag/Al2O3 Catalyst for the Selective Catalytic Oxidation of Ammonia
Abstract
Ammonia (NH 3 ) has potentially harmful effects on human health and has recently been found to be an important factor in the formation of haze; thus, its emission control is urgent, especially during haze pollution periods. In this work, two kinds of Ag/Al 2 O 3 catalysts with different Al 2 O 3 particle sizes (micro-Al 2 O 3 and nano-Al 2 O 3 ) were prepared and tested for the selective catalytic oxidation of ammonia (NH 3 -SCO). It was shown that Ag/nano-Al 2 O 3 was much more active than Ag/micro-Al 2 O 3 for NH 3 -SCO in the low-temperature range. The results of characterization by BET, TEM, NH 3 -TPD, XRD, H 2 -TPR, UV–vis, and XAFS revealed that Ag/nano-Al 2 O 3 possesses much smaller Ag particles and more metallic Ag species (Ag NPs ) and also contains abundant acid sites, which facilitate the adsorption and dissociation of NH 3, therefore resulting in much higher NH 3 -SCO activity. In addition, on the basis of in situ DRIFTS, kinetic measurements, and DFT calculation results, we discovered that the NH 3 -SCO reaction over Ag/nano-Al 2 O 3 follows a reaction pathway we call the N 2 – mechanism.
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Cited by
Sun, H., Wang, H., & Qu, Z. (2023) · ACS Catalysis · doi:10.1021/acscatal.2c05168 · Cited by 298
Metadata
- Authors
- Wang, F., Ma, J., He, G., Chen, M., Zhang, C., & He, H.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-02-14
- Volume
- 8
- Issue
- 4
- Pages
- 2670-2682
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W2789130420
- Cited by
- 264
- References
- 32
- FWCI
- 5.42
- Type
- journal article
- Language
- en
- Open access
- closed
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